Cold Sores and Canker Sores are the most common causes of sores on roof of mouth. Sore roof of mouth causes a great deal of pain and discomfort. Such sores are usually not considered contagious when caused by Canker Sores.
In order to determine if higher minimum wage leads to a higher unemployment two economic professors at Princeton University (David Card and Alan Krueger) conducted a study on minimum wage hikes with a focus on the New Jersey minimum wage hike in 1990. Card and Krueger compared unemployment and wages in New Jersey and Pennsylvania.
Phillips found a consistent inverse relationship: when unemployment was high, wages increased slowly; when unemployment was low, wages rose rapidly. Phillips conjectured that the lower the unemployment rate, the tighter the labor market and, therefore, the faster firms must raise wages to attract scarce labor. At higher rates of unemployment, the pressure abated.